Pantograph engraving-machine.



No. 789.495. x PATENTE) MAY 9, 1905. l. HOPE 3L J. HOPE, JR.

PANTGRAPH ENGIMW'NG` MACHINE.

APPLIOATXON FILED JUNE 3,1398.

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HOIFB n J'. HC19E, JR, PANTG'RAPH ENGRAVING MACHINE.

APPLICATION FILED JUNE 3,1898.

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PATENTED MAY 9, 1905.

J. HOPE L J. HOPE, JR. PANTOGRAPH ENGRAVING MAGIHNB.

APPLIGATION FILED .TUNE 3 SHEETS-SHEET 3.

PATENTED MAY 9, 1905.

J. HOPE & J. HOPE, Jn. PANTOGRAPE ENGRAVING MACHINE.

APPLIUATION FILED .TUNE 3,1898.

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lilivrien drames Partnr Patented May 9, 1905.

RHODE ISLAND, AN D MANUEA O- TURlNGr COMPANY, OE PROVIDENCE, RHODE ISLAND.

SPECIFICATXON forming part of Letters Patent No. 789,495, dated May 9, 1905.

lpplication led June 3,1898. Serial No. 682,428.

Beit known that we, J'onN Horn and JOHN HOPE, Jr., of Providence, in the county of Providence and Staterof Rhode Island, have invented a new and useful Improvement in Pantograph Engraving- Machines; and we hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying' drawings, forming part of this specification.

'.lhis invention has reference to improvements in the class of pantograph engravingmachines nsed for engraving cylinders by tracing with a stylus an enlarged pattern and reproducing one or more reduced patterns on thel roll or cylinder. 11n this class of engraving-machines a partial rotary motion is iniparted to the cylinder and a longitulglinal motion tothe gravers by the movement of the stylus as it is moved over the enlarged pattern. The cylmders in these machines as heretofore constructed were supported at each end on a pair of disks having' milled peripheries, and the gravers were supported on carriages moving' on fixed ways. One of each of the two pairs of supperting-disks was connected with a carriage moving transversely to the cylinder and controlled by the stylus. ln these prior machines the cylinder to be engraved, being' supported at each end on two disks, had four points of contact on the two pairs of disks and two straps for rotating the cylinder, which straps with the most careful adjustment were liable to draw unevenly on the milled disks and produce defects in the engraving by an apparently slight backlash in the carriage or the straps. A type of the most improved pantograph engravingmachines of this old construction is shown in the United States Patent No. 462,874, granted to John Hope November lO, 1891, for improvements in pantograph engravingmachines. Another defect in these machines is that the bars and carriages supporting gravers were, owing to the space taken up by the supporting-disks, at such a distance from the cylinder to be engraved that the diamond or graver them of complicated construction and liable to spring, thereby producing' defective designs on the cylinder.

One object of the invention is to simplify the construction of the machine.

Another object of the invention is to support the gravers closer to the work.

The invention consists in the peculiar and novel construction and the combination of the parts, as will be more fully set forth hereinafter.

Figure 1 is an end view of our improved pantograph engraving-machine. Fig. 2 isa front view of the same. Eig. 3 is an enlarged end view of the cylinder to be engraved supported at one end on the disk, the longitudinally-reciln'ocating carriages and the swing'- ing arm operating the same. Eig. 4 is a transverse sectional view of the cylinder, showing the supporting-disk connected with the transversely-moving frame by which the cylinder is rotated. Eig. 5 is a view, partly in section, showing the bar connecting' two adjacent carriages with the swinging arm. Fig. 6 is a side view of a detail, showing the arm by which two carriages are connected to reciprocate together. Eig. T is a top view showing the ends of one of the rear carriages connected with the front carriage and the end ways pivotally secured to the carriages, whereby either or both lnay be connected with the swinging arm. Fig. 8 is a top view showing' the support for one end of the cylinder and the swinging arm connected with one of the rear carriages. Eig. 9 is a top view showing the milled disk supporting the opposite end of the cylinder and the connection with the frame by which it is operated.

Similar marks of reference indicate corresponding' parts in all the iigures.

In the drawings, A indicates the standard forming the support for the machine; a, ways secured to the top of the standard A and forming the support of the table a. on which the enlarged pattern is secured; a, transverse ways secured to the standard A, supporting the rollers a a, on which rest the end frames holders were rc uircd to be lonO' some ofi a" et* connected b f the rails ai t5 on which the stylus-carriage is supported. The stylus a7 is secured in a bracket hinged on the stylus-carriage a and provided with handles. The operator, usually a woman having good eyesight and steady hands, moves the stylus along the lines of the enlarged pattern and in doing so moves the stylus-carriage fr," on the rails if af" and through the end frames a* afl on the ways a?, thereby producing in tracing any oblique or curved line. For the purpose of simplifying the specilication the parts indicated by the letter (t, so tar described, will will be referred to hereinafter as thc stylusframe.7 rlhe longitudinal movement oi' the stylus is transmitted from the stylus-carriage by the arm C, the free end of which is connected by a pin to the stylus-carriage and the transverse motion by the arm D, the free end of which is connected with the end Jframe a* by means of a post projecting from the arm and having a ball-shaped end sliding in a groove extending` in a longitudinal direction, as shown in Fig. 2. Every movement of the stylus-frame in tracing the enlarged pattern is transmitted by the arm C to the carriages and the gravcrs carried longitudinally by the same and by the arm D to the milled disk supporting and operating the cylinder to be engraved, so as to partially rotate the same.

The arched frame or standard B is secured at the opposite ends to the standard A. It extends upward and over the stylus-trame and is provided with the rearwardly-extending bracket B. rlhe standard B is of a substantial and rigid construction and forms the support ot' the cylinder to be engraved and ior the operative parts by which the engraving of the cylinder is aiiected.

rl`he arm C is pivotally connected with the vertical shaft c, secured to the plate c. This plate c is provided with a way, usually a groove of dovetail section, extending' across the axial center of the vertical shaft c. The post c2 extends upward from a carriage which slides in the way of the plate c' and may be secured at any desired distance from the axial center of the vertical shaft c either outwardly or inwardly from this center. The relative distance ot' the post c2 from the center of the vertical shaft c to the point of the arm C in contact with the pin on the stylus-carriage determines the proportion the engraved pattern on the cylinder bears to the engraved pattern traced by the stylus in one direction. The vertical shaft c and the plate c are pret'- erably supported on ball-bearings, as is indicated in Fig. i. The post c2 enters a groove in the arm c. This arm is bifurcated at the end where it is pivotally connected with the carriage ci, as is shown in Fig. 2, at a considerable distance apart to secure rigidity, Jfor by means or the arm c reciprocating motion is imparted to all the carriages by which the gravers are supported and operated. The carriages t", c5, and c are supported on rollers running in thc grooves of ways, adjustably secured at their opposite ends to the end frames B2 B2 at the rear of the cylinder E to be engraved, and the carriage c7 is similarly supported in front of the cylinder E. The carriages c" and c are connected by means of the brackets as, as shown in Fig. 6 and indicated in broken lines in Fig. 3. The lower ends of these brackets es are adjustably secured byva T-bolt sliding in a longitudinal way of the carriage, and the upper end is held between two adjusting-screws in the clamp c, also secured by a T-bolt to the upper carriage, as is indicated in Fig. 3. The carriage c7 may be connected with the carriage c near the opposite ends by means of the connecting-bar om, as is shown in Fig. 7, so that all the carriages move together and are operated simultaneously by the arm c3.

lt is at times desirable to move one or all the carriages c4, 05, and c in one direction and move 'the carriage c7 on the opposite side of the cylinder E in the opposite direction. To this end the bar cl is removed and the swinging arm @u is pivotally supported at its center on the bracket cl2, as shown in Figs. l, 3, and 8. On one end ot' the swinging arm cu the post 013, having globular ends, is held by a spiral spring in contact with a groove in the bracket c, secured to the carriage c1, and a rigid post c, having a globular upper end, is secured at the opposite end of the swinging arm c, so that the posts c13 and ch" will move through exactly the same distance, but in opposite directions. The carriages and c7 are provided at one end oi' each with the plates c1, having on their under side grooves extending transversely to the ends of the carriages, as is indicated in broken lines in Fig. 7. The plates c1 are each provided with a set-screw 017, having a milled head. The ends of these screws bear on the carriages or a projecting part ot' the same and sustain the plates c1 in the raised position when disconnected. By turning these screws c the plates may be connected with the posts cl3 and c15 Qn the swinging arm c, and when so connected the carriages c4 and c5 will move together in the same direction, and the carriage c7 will move with them, but in the opposite direction.

The gravers are secured to the arms cls, which are supported on and move with the carriages. The arms cls are provided with tailpieces acted on by mechanism, more fully described hereinafter, to control the gravers.

The cylinder E is supported at one end on the disk d, journaled in suitable bearings in the frame secured to the top of the arched standard B, and at the other end on the milled disk (Z2, journaled, with the adjacent disk Z3 of somewhat smaller diameter, in bearings formed in the frame 52, also secured to the arched standard B. The cylinder E is supported on the disks Z' and Z2 slightly to the rear of the perpendicular center ot' these ICO IIS

disks, so as to bear on the rollers ZJ ci" at the opposite ends. The rollers KZ" d" are journaled in the brackets b3 If, which are adjustably secured tothe frames and 7/2. In the prior construction, owing to the disposition ol the weight olg the cylinder, two milled disks had to be connected with and operated by a iframe connected with the milled disks at both ends ot the cylinder E, which frame, owing to its leng'th and comparatively short traverse, was liable to produce errors or inaccuracies in the partial rotation of the cylinder, all of which is remedied by the present construction, in which a long narrow slide Inoving transversely operates only one milled disk, on which one end of the cylinder E rests, the other end resting on a smooth disk.

The forward-and -backward movement of the stylus in tracing the pattern moves the stylus-iframe, and with it the free end of the arm D, inward and outward. The armD is secured to and extends Yfrom the arm (Z, supported on the arched standard B, preferably on roller-bearings, as is indicated in Fig. 2. A slide (Z0, provided with a post having a globular end, is adjustably secured to the arm (l, usually by a 'lV-bolt slidingl in a groove, such as is shown in the carriages in Fig. 3. rlhe inward-andoutward movement of the stylus-frame is transmitted by the arm D to the post on the arm Z on a reduced scale corresponding with the difference in the distance ot' the respective posts on these arms from the axial center on which they swing. The arm (ZT has a longitudinal groove in which the globe-shaped end of the post on the slide d enters. The arm (Z7 has its bifurcated ends connected with the carriage d, as is shown in Fig. 9. The steel bands al (ZSare secured to the adjustable clip Z 'o on one end of the carriage di and to the periplieral face orI the disk d, and the steel band .Z is secured to the clip film on the other end of the carriage al" and to the peripheral surface of the disk d3. By the thumb-nuts Z u, which engage with screw-threaded stems on the clip (Zw, the tension on the steel bands may be adjusted. By moving' the carriage Z5 inwardly or outwardly the motion is transmitted to the disk al and the disk (Z2, having the milled peripheral surface, and by the same to the cylinder E, resting on the milled surface or' the disk d 2, and by means ot' the arms l), d, and (Z7 the forward-and-backward movement oi' the stylus and stylus-frame is communicated to the carriage Zaand through the steel bands and the disks Z2 and d3 transmitted as rotary motion to the cylinder.

T he gravers are controlled by the foot of the operator through the foot-treadle c to the pivotal shaft on which the lever d is secured, counterweighted by the weight di. The rods c, c", and are pivotally secured to the lever c. The rod c3 is connected near its upper end with the lever e, which is secured to a rocking bar 7, pivotcd in the brackets one of which is secured to each end oi" the arched .frame B. The rocking bar .17 bears on the tailpiece oi" the arm or arms c, to which the graver is secured. I he rod e" is also secured to a lever c,`connected with a longitudinal rocking bar supported in brackets 7) b at the rear of the machine. '.lwo rocking bars are shown in Fig. l connected by the rod e, so as to be operated together. 'lherod is connected with a lever e, which is connected to a rocking bar placed below the tail end of the arm supporting the graver, so that by raising 'the rear end et the supporting-arm the graver is moved away from the roll E. The weight (f acts on the lever c' by gravity to keep the foot-treadle e in the raised position and holds the gravers oi' from the cylinder E to be engraved. The operator by pressing on the foot-treadle e brings all the gravers into contact with the cylinder E while the stylus is moved to trace the pattern, whereby the pattern is engraved on the roll ata reduced scale.

The arm c3 may be connected with the upper carriage c by extending two arms, one from either side ot' the plate t, and uniting them in a plate at the top, as is indicated in broken lines in Fig. l, sul'licient space being lei't between the two arms to allow ol'I the movement of the lower arm c.

Having thus described our invention, we claim as new and desire to secure by Letters Patentl. 1n a pantograph engi-aving-machine for engraving cylinders. the combination of the following instrumentalitiesz two disks, supported in journal-bearings one near each end of the machine, and which form the vertical support ol the cylinder to be engraved, two brackets, one near each end ol" the machine, provided with rollers Vforming the side support of the cylinder to be engraved above the contact-point of the cylinder to be engraved with the disks, carriages upon which are mounted the gravers, a pattern-table 'for the support of the pattern, a stylus-frame moving with the stylus in tracingthe pattern, actuating mechanism connecting the stylustrame with the carriages, and actuating mechanism connecting the stylus-frame with one of the disks supporting the cylinder to be engraved; whereby the pattern traced by the stylus is reproduced son the cylinder, as described.

2. In a pantograph engraving-machine for engraving cylinders, in combination, a standard forming the support o1 the pattern-tame and the stylus-trame. an arched frame supported at opposite ends on the standard, two disks one near each end of the machine journaled in bearings supported on the arched frame and upon which the cylinder to be engraved rests, brackets one near cach end of the machine having rolls forming the side supports of the cylinder to be engraved above IOO IIO

the line of contact of the cylinder to be engraved with the disks, carriages carrying gravers, and actuating` mechanism controlled by the stylus; whereby the carriages are reciprocated and the cylinder rotated, as described.

3. In a pantograph engraving-machine for engraving cylinders, the combination 'with two disks journaled in suitable bearings and upon which the cylinder to be engraved rests, of two rolls journaled in suitable bearings to form the side support of the cylinder to be engraved above the line of contact of the cylinder to be engraved with the disks, as described.

4. In a pantograph engraving-machine for engraving cylinders, the combination with the frame of the machine, of the two disks one near each end of the machine upon which the cylinder to be engraved rests, two brackets one near end of the machine provided with rollers forming the side support of the cylinder to be engraved above the line of contact of the cylinder to be engraved with the disks, carriages supporting' gravers adapted to engrave the upper and lower part of the cylinder, mechanism connected with one of the disks for rotating the cylinder to be engraved, and a stylus-frame for operating both mechanisms, as described. n

5. In a pantograph engraving-machine for engraving cylinders, the combination with two disks d' (Zgjournaled in suitable bearings, one near each end of the machine, and the adjustable brackets 71353 having the rollers Z f (il located above the highest points of the disks, of the carriages supporting the gravers, and adjustable supports for the carriages, whereby the carriages and the cylinder may be relatively adjusted, as described.

6. In a pantograph engraving-machine for engraving cylinders, in combination, two carriages on opposite sides of the cylinder, a swinging arm, posts in the opposite ends of the swinging arm, and grooved plates secured to the carriages; whereby the longitudinal motion of one carriage is transmitted to move the other carriage in the opposite direction, as described.

7. In a pantograph engraving-machine for engraving cylinders, thecombination with the carriages on opposite sides of the cylinder to be engraved and the graver-holders on the carriages, of the centrally-pivoted swinging arni c, the posts cl3 and 015 on the arm, and the plates c1 c1G pivotally connected with the carriages and adapted to connect the carriages with the swinging armywhereby the two carriages are caused to reciprocate in opposite directions, as described.

S. In a pantograph engraving-machine, the combination with the carriages 0l and c, of the brackets c adjustably secured at opposite ends to the two carriages; whereby the carriages are connected to move together or disconnected from each other, as described.

9. .In a pantograph engraving-machine, the combination with the carriages ci and c7 located on opposite sides of the cylinder to be engraved and of the end bars cw cm; whereby the two carriages may be connected together to reciprocate in unison, as described.

l0. In a pantograph engraving-machine,the combination with the'disk ril, the disk dfhaving a milled peripheral surface, the said two disks forming the sole vertical support of the cylinder to be engraved, of the disk d. the transversely-sliding table (Z5, and the steel straps ZS Z8 and d each secured at one end to the table and at the other endv to the disk cl3; whereby the cylinder to be engraved is operated at one end by the disk forming the sole support of that end, as described.

il. In a pantograph engraving-machine,the combination of the following instrumentalities: a standard forming the support of the pattern-table, ways for the support of the stylus-frame, an arched frame supported at opposite ends on the standard and extending over the stylus-frame, two disks journaled in bearings supported on the arched frame and forming the sole vertical support for the cylinder to be engraved, adjustable brackets having rolls forming the side support of the cylinder to be engraved, carriages moving' on ways adjustably secured to the end frames,

arms supporting the gravers carried on the carriages, a stylus-frame, a stylus-carriage on the stylus-frame, a transversely-moving table connected with and operating one of the supporting-disks for rotating the cylinder being engraved, mechanism connecting the stylusframe with the transversely moving` table, mechanism connecting the stylus-carriage with the graver-carriages and the mechanism connecting the foot-treadle with the rocking bars controlling the gravers; whereby the carriages supporting the gravers may be placed closer to the cylinder being engraved to form a more rigid support for the gravers and the cylinder being engraved is controlled at one end, as described.

In witness whereof we have hereunto set our hands.

JOHN HOPE. JOHN HOPE, JP..

IVitnesse-s:

B. M. SmioNs, J. A. MILLER, Jr. 

